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After taking a nearly six-year hiatus, "Fear Factor" is back with a vengeance and making new disgusting headlines.

While NBC usually gives a decent amount of freedom to the "Fear Factor" minds so they can execute some sick and twisted stunts, turns out there is one episode, originally set to air tonight, that has just been nixed in favor of a re-run.

So what was on this evening's extra-special menu? Contestants were required to chug glasses of ... donkey semen.

The stunt had NBC and their parent company Comcast, feeling a bit squeamish, to say the least.

In honor of the disgusting challenge that, alas, will never be seen, here are the top five grossest stunts in "Fear Factor" history.